Method for spraying a medium and spraying nozzle

Abstract

A method for spraying a medium mist, especially a medium mist used in firefighting, over a large area, in which method at least two sprays of medium mist are formed, of which a first spray (S 1 ) is within a second medium mist spray (S 2 ) at least at or near the spraying point. During the formation of the sprays (S 1 , S 2 ), the medium is set into a swirling motion at least before the discharge opening ( 5, 13 ) of the nozzle used to form each spray (S 1 , S 2 ) and/or at least before the sprays (S 1 , S 2 ) are mixed with each other, and that the swirling directions of the medium in different sprays (S 1 , S 2 ) are opposite to each other, whereby a preferably homogeneous mist spray spread over a large area is achieved.

1. A method for spraying a medium mist, in which method at least two sprays of medium mist are formed, of which a first spray (S 1 ) is within a second medium mist spray (S 2 ) at least at or near the spraying point, in which method during the formation of the sprays (S 1 , S 2 ), the medium is set into a swirling motion at least before the discharge opening ( 5 ,  13 ) of the nozzle used to form each spray (S 1 , S 2 ) and/or at least before the sprays (S 1 , S 2 ) are mixed with each other, and that the swirling directions of different sprays (S 1 , S 2 ) and/or of the medium used to produce them are opposite to each other, whereby a preferably homogeneous mist spray spread over a large area is achieved, wherein the first spray (S 1 ) is delivered via the discharge opening ( 5 ) of a first nozzle chamber and the second spray (S 2 ) via the discharge opening ( 13 ) of a second nozzle chamber, which latter discharge opening ( 13 ) has a ring-like shape and surrounds the first nozzle opening ( 5 ),
 said method further comprising the formation of at least one third spray (S 3 ), within which the first spray (S 1 ) and the second spray (S 2 ) remain at least at or near the spraying point, so that the swirling directions of the medium of each adjacent spray (S 1 , S 2  and S 2 , S 3 ) are opposite to each other at least before the discharge opening ( 5 ,  13 ,  16 ) of the nozzle used to form each spray and/or at least before the adjacent sprays (S 1 , S 2  and S 2 , S 3 ) are mixed with each other. 
 
     
     
       2. A method according to  claim 1 , wherein the medium is fed into the nozzle chamber ( 4 ,  6 ,  7 ) of the spraying nozzle forming each spray in such a way that a swirling motion of the medium is set up before the nozzle opening. 
     
     
       3. A method according to  claim 1 , wherein the first spray (S 1 ) is delivered via the discharge opening ( 5 ) of the first nozzle chamber and the second spray (S 2 ) via the discharge opening ( 13 ) of the second nozzle chamber, which latter discharge opening ( 13 ) has the ring-like shape and surrounds the first nozzle opening ( 5 ) in the direction perpendicular to the spraying direction. 
     
     
       4. A method according to  claim 1 , wherein the spraying medium is a liquid or a mixture of a liquid and a gas. 
     
     
       5. A spraying nozzle, comprising a frame ( 1 ) with an inlet ( 2 ) formed therein, a first nozzle chamber ( 4 ) with one first nozzle opening ( 5 ), a second nozzle chamber ( 6 ) with a discharge opening ( 13 ), and at least one medium passage ( 9 ,  10 ) from the inlet ( 2 ) to each spraying chamber ( 4 ,  6 ), wherein the spraying nozzle further comprises means ( 9 ) for conducting a spraying medium into the first spraying chamber ( 4 ) in such a way that the spraying medium is caused to swirl in a first direction, and means ( 10 ) for conducting a spraying medium into the second chamber ( 6 ) in such a way that the spraying medium is caused to swirl in a second direction, which is substantially opposite to the swirling direction of the medium conveyed into the first chamber ( 4 ), wherein the discharge opening ( 13 ) of the second nozzle chamber ( 6 ) is formed as a ring-like opening around the discharge opening of the first nozzle chamber ( 4 ),
 wherein the spraying nozzle further comprises at least one third chamber ( 7 ), whose discharge opening surrounds the discharge openings ( 13  and  5 ) of the second chamber ( 6 ) and the first chamber ( 4 ), and means for conducting a spraying medium into the third chamber ( 7 ) in such a way that the medium is caused to swirl in a first direction, which is opposite to the swirling direction of the medium conducted into the second chamber ( 6 ). 
 
     
     
       6. A spraying nozzle according to  claim 5 , wherein the means ( 9 ,  10 ,  11 ) comprise at least one medium passage ( 9 ) through which the spraying medium is conducted into at least one nozzle chamber at least partly in a substantially tangential direction. 
     
     
       7. A spraying nozzle according to  claim 5 , wherein each chamber ( 4 ,  6 ,  7 ) comprises at least one medium conduit ( 9 ,  10 ,  11 ), through which the spraying medium is conducted into the spraying chamber. 
     
     
       8. A spraying nozzle according to  claim 5 , wherein the spraying nozzle comprises a mixing chamber ( 15 ), and the nozzle opening ( 5 ) of the first spraying chamber ( 4 ) and the ring-like nozzle opening ( 13 ) of the second spraying chamber ( 6 ) open into the mixing chamber ( 15 ), from where the medium sprays of the first spraying chamber and the second spraying chamber are passed out through a discharge opening ( 14 ). 
     
     
       9. A spraying nozzle according to  claim 5 , wherein the third spraying chamber ( 7 ) has a ring-like discharge opening ( 16 ). 
     
     
       10. A spraying nozzle according to  claim 5 , wherein the medium spray (S 1 ) sprayed from the first spraying chamber forms a conical spray and the spray (S 2 ) from the second spraying chamber a ring-like conical spray, inside which the first spray (S 1 ) is sprayed. 
     
     
       11. A spraying nozzle according to  claim 5 , wherein the spray from the third spraying chamber is a ring-like spray (S 3 ) which is spread over a larger area and inside which the first spray (S 1 ) and the second spray (S 2 ) are sprayed. 
     
     
       12. A spraying nozzle according to  claim 5 , wherein the spraying medium is a liquid or a mixture of a liquid and a gas. 
     
     
       13. A spraying nozzle according to  claim 5 , wherein the spraying nozzle further comprises at least one ring-like nozzle, which is arranged on a circle larger than a discharge opening of a third nozzle. 
     
     
       14. A spraying nozzle, comprising a frame ( 1 ) with an inlet ( 2 ) formed therein, a first nozzle chamber ( 4 ) with one first nozzle opening ( 5 ), a second nozzle chamber ( 6 ) with a discharge opening ( 13 ), and at least one medium passage ( 9 ,  10 ) from the inlet ( 2 ) to each spraying chamber ( 4 ,  6 ), wherein the spraying nozzle further comprises means ( 9 ) for conducting a spraying medium into the first spraying chamber ( 4 ) in such a way that the spraying medium is caused to swirl in a first direction, and means ( 10 ) for conducting a spraying medium into the second chamber ( 6 ) in such a way that the spraying medium is caused to swirl in a second direction, which is substantially opposite to the swirling direction of the medium conveyed into the first chamber ( 4 ), wherein the discharge opening ( 13 ) of the second nozzle chamber ( 6 ) is formed as a ring-like opening around the discharge opening of the first nozzle chamber ( 4 ),
 wherein the spraying nozzle further comprises at least one third chamber ( 7 ), whose discharge opening surrounds the discharge openings ( 13  and  5 ) of the second chamber ( 6 ) and the first chamber ( 4 ), and means for conducting a spraying medium into the third chamber ( 7 ) in such a way that the medium is caused to swirl in a first direction, which is opposite to the swirling direction of the medium conducted into the second chamber ( 6 ), and 
 wherein the third spraying chamber ( 7 ) has a ring-like discharge opening ( 16 ).